diff --git a/server/tools/protobuild/metatable.proto b/server/tools/protobuild/metatable.proto
index ff0eb57..664b90f 100755
--- a/server/tools/protobuild/metatable.proto
+++ b/server/tools/protobuild/metatable.proto
@@ -449,4 +449,5 @@ message MapBlockJson
     optional float height = 7;
     optional float width = 8;
     optional float rad = 9;
+    optional int32 bullet_penetrate = 10;
 }